Duels

Fix: item staking (and manually dragging items into the kit editor) never actually worked - InventoryListener was cancelling every click on the player's own inventory while any Duels menu was open, not just clicks on the menu itself, including the pickup click needed before dragging an item into an editable slot. A plain click on your own inventory can't place anything into the top inventory by itself, so there's nothing to protect by cancelling it; shift-click stays blocked since vanilla auto-transfers it into the top inventory.